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Per building code applicable in most areas, the existing two layers of shingles need to come off. Once that happens, you should be able to assess the cost of fixing the ridge. The linear lines of most metal roofs can really end up accentuating roof dips and swales as well as ridge problems.
To expand upon Todd’s reply, once the structure is assessed, if it is deemed sound, there are metal roof products that can use battens and shims to “hide” some of the deflection that your ridge may be experiencing.
The use and success of such installs would have to be part of a discussion with trained professionals during the assessment and before the installation.
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